Hi Ann
Prior to our current travel trailer, we pulled a pop-up to FW several times with a cruising speed of about 70-75 mph, without incident. Although I don't know the size of your trailer, if your tow rig is set up properly, you should have no problems. Just pay attention the first few times you pass, or are passed by a semi, or bus and be prepared for some minor trailer sway.
Just a couple of tips to avoid mechanical delays:
One thing I always do to avoid potential problems, especially with trailers with small wheels, like a pop-up, is install bearing protectors.
Small trailer wheels must spin faster than the larger ones on your vehicle, increasing their grease consumption. A burned wheel bearing and scored spindle will put a real crimp in your schedule. Repacking the wheel bearings annually will insure you have no problems, but I find that quite a hassle.
Wal-Mart sells Red Eye brand bearing protectors in their boating dept. These fit into the wheel hub and allow you to grease the bearings, without disassembling the hub. They even have an indicator to tell you when to stop greasing so you don't inadvertently blow out the bearing seals. At about $12.00 a pair, they're just about the cheapest travel insurance you can buy. Measure the inside diameter of your wheel hub before purchasing, as they come in different sizes.
Make sure your the trailer tire sidewalls aren't split, or cracked (don't forget the inside sidewall) and carry a spare trailer wheel and tire. Before you leave, make sure your tow vehicle's jack will fit under the trailer frame and its lug wrench fits the trailer lug nuts. If they don't, pack some that do. Although you may be able to lift the trailer with its frame jacks, if you can't get the lug nuts off, you're still stuck. Check the tightness of the nuts daily while on the road.
Finally, make sure the trailer lights are working properly and consistently. If the lights work intermittently before you leave, they will surely fail on the road. Clean the harness contacts with fine emery cloth and coat them with conductive electrical grease (available at Wal-Mart, what isn't?)
Sorry for the long post. Enjoy your trip!
<html>
<body>
<img SRC="http://www.redstoneprojects.com/images/fortwildernesslogo.gif" height=156 width=205>
Qui desiderat pacem, praeparet bellum
</body>
</html>